Ultra short wave auxiliary apparatus



y 1936- M. VON ARDENNE ULTRA SHORT WAVE AUXILIARY APPARATUS Filed March 14, 1932 Patented July 14, 1936 PATENT OFFICE ULTRA SHORT WAVE AUXILIARY APPARATUS Manfred von'Ardenne, Berlin, Germany, assignor to Radicaktiengesellschaft D. S. Loewe, Berlin- Steglitz, Germany, a company of Germany Application March 14, 1932, Serial No. 598,629 In Germany March 16, 1931 4 Claims.

The present invention relates to an arrangement for the reception of ultra-short WBNGSI, which is preferably constructed in the form vof an auxiliary apparatus and, according to the inn vention, may be employed for the reception of both low-frequency as well as high frequency modulated ultra-short waves.

This is accomplished by the fact that the output circuit of the ultra-short Wave demodulator includes a coupling system, which on the one hand permits to exist at the anode a suflicient highfrequency potential in the case of high frequencies as well as a sufficient low-frequency potential in the case of low frequencies, and which also allows a perfect sufiicient transmission of both the high as well as the low frequencies.

This coupling system preferably consists of a resistance-condenser combination, whereby a resistance is provided in the anode circuit of the ultra-short wave modulator, and whereby the alternating voltage occurring at the same is conducted over a condenser to a second resistance. Assuming the reception of ultra-short waves modulated by low-frequencies, there may be con- 25 nected to said second resistance low-frequency amplifiers of the normal kind, for example transformer coupled amplifiers or resistance coupled low-frequency amplifiers, whereby the coupling with the amplifier may lead either, direct to. the 30 grid, or over a transformer to the grid of the first amplifying stage. Assuming that the reception of ultra-short waves modulated by high-frequencies is concerned, whereby in the majority of cases the high frequencies are again modulated by 35 low frequencies, for example for the ultra-short wave transmission by radio transmitters, it is possible to connect with the second resistance either, in direct fashion, a high frequency amplifier or an audion or an anode rectifier or, over 40 a transformer coupling, a capacitive coupling or the like. If it is desired to connect with this resistance oscillatory circuits, either directly or indirectlyand this will be necessary or at least desirable in the majority of cases occurring in 45 practicethe condenser of the coupling system between the two coupling resistance requires, on account of the relatively low first coupling resistance, which is located in the anode circuit of the ultra-short wave demodulator, to be made 50 sufficiently small to prevent damping of the oscillatory circuit. The coupling resistance located in the anode circuit of the ultra-short wave demodulator requires to be sufiiciently small in order, as regards the high frequencies, to permit 55 of sufiicient utilization of the amplification of the tube l in View of the unavoidable capacitive loading, but on the other hand should not be too small to prevent proper amplification of the low frequencies.

The invention is illustrated in the drawings in 5 several possible forms of embodiment.

In Fig. 1 there is shown an ultra-short wave demodulator, comprising a rectifier tube i, an audion condenser 2 (of, for example,60 cm.capacity),

a grid leak resistance 3 (of, for example, 0.5 10 ohms), and an oscillatory circuit, which is constituted by the wire winding 4 and the tuning condenser 5 (of, for example, 50 cm. capacity). To the one pole of the coil there is connected the ultra-short wave aerial 6. The differential condenser l, which may also be omitted, permits of a back-coupling of the ultra-short wave. The anode circuit is completed over an ultra-high frequency choke 3 (of, for example, nine windings), the first resistance 9 (of, for example, 20,000 ohms), and the battery 12, which is shunted by the condenser is. The low frequency or high frequency liberated by the demodulation is conducted to the second resistance of the coupling system I! (of approximately ,105 ohms) over the condenser ill (of, for example, 10 cm. capacity).

As mentioned above, there may be connected to the terminals l 4 and I5 of this resistance low frequency amplifiers, high frequency amplifiers or high frequency demodulators (detectors, audions or anode rectifier), either directly or through the medium of transformers or other coupling systems. In the possible form of embodiment according to Fig. 1 there is connected a normal radio receiver, consisting of a coupling transformer IS, a tuning condenser H, the rectifier tube l8, and the after-connected low frequency amplifier (IS). The input of the radio receiver may also be constructed as shown in Fig. 2, in which the high frequency potential passed to the coupling transformer 16 is graded by a special differential condenser 20.

In Fig. 3 the coupling system is connected over a low frequency transformer 2! with a low frequency amplifier for the reception of ultra-short 4,5 waves modulated by low-frequencies.

Fig. 4 shows a similar arrangement, in which a resistance coupled low frequency amplifier is connected with the coupling system in direct fashion.

Fig. 5 shows the coupling of a high frequency receiver with a high frequency amplifier stage 22,

a rectifier 23, and low frequency amplifier stage 24.

I claim:

1. An ultra-short wave demodulator set forth for coupling an ultra-short wave antenna-circuit with a low-frequency amplifier or with a high-frequency amplifier or with a radio receiver having a rectifier input stage, a demodulator tube with anode, grid and cathode, an input oscillatory circuit connected with said tube for coupling with said antenna circuit and an output circuit connected with said tube, for coupling with said amplifier or said radio receiver, said output circuit consisting of an anode-current-source, an ultrahigh frequency inductance, and a resistance-capacity coupling consisting of a plate resistance in the order of 2,000 ohms, a coupling condenser in the order of 0.01 microfarads, a grid leak resistance and two terminals connected with the ends of said grid leak resistance for connecting said set with said amplifier or said radio receiver.

2. An ultra-short wave demodulator set forth for coupling an ultra-short wave antenna-circuit with a low-frequency amplifier or with a highfrequency amplifier or with a radio receiver having a rectifier input stage, a demodulator tube with anode, grid and cathode, an input oscillatory circuit connected with said tube for coupling with said antenna circuit and an output circuit connected with said tube for coupling with said amplifier or said radio receiver, said output circuit consisting of an anode-current-source, an ultrahigh frequency inductance and a resistance-capacity coupling consisting of a plate resistance in the order of 2,000 ohms, a coupling condenser in the order of 0.01 microfarads, a grid leak resistance and two terminals connected with the ends of said grid-leak resistance for connecting said set with said amplifier or said radio receiver, said input oscillatory circuit consisting of an inductance in parallel connection with a tuning condenser connected with said anode and over a condenser with said grid, a grid leak resistance connected with said grid and said cathode, a differential condenser in parallel connection with said input inductance for controlling the backcoupling, the movable plate of said differential condenser connected with said cathode and a terminal on the anode for coupling said input circuit with said antenna circuit.

3. A11 ultra-short wave demodulator set forth for coupling an ultra-short wave antenna-circuit with a low-frequency amplifier or with a highfrequency amplifier or with a radio receiver having a rectifier input stage, a demodulator tube with anode, grid and cathode, an input oscillatory circuit connected with said tube for coupling with said antenna circuit and an output circuit connected with said tube for coupling with said amplifier or said radio receiver, said output circuit consisting of an anode-current source, an ultrahigh frequency inductance and a resistance-capacity coupling consisting of a plate resistance in the order of 2,000 ohms, a coupling condenser in the order of 0.01 microfarads, a grid leak resistance and two terminals connected with the ends of said grid-leak resistance for connecting said set with said amplifier or said radio receiver, said input oscillatory circuit consisting of an inductance in parallel connection with a tuning condenser connected with said anode and over a condenser with said grid, a grid leak resistance connected with said grid and said cathode, a differential condenser in parallel connected with said input inductance for controlling the back-coupling, the movable plate of said differential condenser connected with said cathode and a terminal on the anode for coupling said input circuit with said antenna circuit, said input grid condenser being in the order of 60 cm. and said input grid leak resistance being in the order of 500,000 ohms.

4. An ultra-short wave demodulator set forth for coupling an ultra-short wave antenna-circuit with a low-frequency amplifier or with a highfrequency amplifier or with a radio receiver hav- 5 ing a rectifier input stage, a demodulator tube with anode, grid and cathode, an input oscillatory circuit connected with said tube for coupling with said antenna circuit and an output circuit connected with said tube for coupling with said amplifier or said radio receiver, said output circuit consisting of an anode-current source, an ultra-high frequency inductance and a resistance-capacity coupling consisting of a plate resistance in the order of 2,000 ohms, a coupling condenser in the order of 0.01 microfarads, a grid leak resistance and two terminals connected with the ends of said grid-leak resistance for connecting said set with said amplifier or said radio receiver, for coupling said output circuit with a radio receiver with input transformer, a difierential condenser included in the one of said terminal lines, the movable plate of this differential condenser connected with the other of said terminal lines.

MANFRED VON ARDENNE. 

